Andy Serkis, via motion capture, returns one last time for more monkey business as Caesar, the Moses of intelligent apes.

Caesar is in the woods, with his apes, and just wants to be left alone; to brood over his murder of rival Koba (Toby Kebbell), and raise his new young son. But not only have Koba’s followers started to collaborate with the humans against Caesar in order to avenge his death, the humans have also become menacingly organised under a new leader, the Colonel (Woody Harrelson). An early bloody skirmish is followed by a night raid with the Colonel himself attempting to terminate Caesar’s command, with extreme prejudice. Caesar abdicates his duties as leader, vowing revenge. While the apes set out for the promised land beyond the desert, Caesar, with trusted lieutenant Maurice the orangutan (Karin Konoval), and two gorilla bodyguards, sets out to assassinate the Colonel. But matters are complicated by a new mutation of the virus assailing humanity.

War for the Planet of the Apes would be more accurately titled Commando Raids for the Planet of the Apes. Indeed a large portion of the movie is Prison Break for the Planet of the Apes, cycling back to the pivotal sequence of 2011’s Rise of the Planet of the Apes where super-intelligent Caesar was incarcerated with regular chimpanzees – because he chewed off a man’s fingers for being rude. Blake Snyder’s ‘Save the Cat’ does not advocate having your hero chew off a man’s fingers for being rude to elicit audience sympathy, quite the opposite really. Yet we are expected to automatically root for Caesar through three films progressively less interested in human characters. If one could call the ciphers in this franchise human. This is surely the worst written trilogy this decade, and logically so; if an audience accepts ciphers, why bother sweating writing characters? If an audience accepts Gary Oldman’s noble sacrifice to save humanity resulting in nothing, why bother even setting up protagonist and antagonist humans? Woody Harrelson’s Colonel McCullough is the only articulate human, and even Harrelson can’t excel with this straw man antagonist. Hard to credit this franchise was spawned by Rod Serling’s mischievous screenplay.

Rupert Wyatt in Rise, and Matt Reeves in Dawn, both threw in striking sequences of directorial bravura to try and paper over the poor scripting. But here, there is nothing going on in that department, which is a tremendous surprise given that Reeves returns as director. Where are his visual trademarks – the lengthy tracking shots following chaos exploding into frame, the fixed-position sequences, the Hitchcockian visual suspense? This is all the more surprising given the unsubtle references to the visually extravagant Apocalypse Now: slogans daubed everywhere, a shaven-headed Colonel expounding on history, culture and morality, a mission to exterminate (‘The only good Kong is a dead Kong’), Jimi Hendrix, and, just in case you didn’t get it, ‘Ape-pocalypse Now’ graffiti. It’s as if Reeves has just given up, going through the motions in a permanently 3-D darkened landscape of snow and concrete that renders things verily sepia-vision. Steve Zahn as a nebbish ape is a highlight, mostly because, when dressed akin to Bob Balaban’s Moonrise Kingdom narrator, he appears to have wandered in from Wes Anderson’s Planet of the Apes; the idea of which is more entertaining than this tedious movie, dragged out by its insistence on ape sign language.

The powerful and emotive finale is unintentionally hilarious when you realise just how literal the Caesar as Moses motif is being taken, but it’s just one final plodding mis-step. Caesar blows up the Colonel’s base and yet escapes the fiery blastwave because it is all-encompassing but apparently all to one side just to avoid enveloping him, Caesar’s final confrontation with the Colonel sees him extend a character redeeming mercy that looks uncannily like the height of cruelty, and the new mutation of the virus, which reduces humans to mute amiable simpletons, leads us seamlessly into the world of the Charlton Heston classic. So, we are required to cheer for the devolution of the human race into mute amiable simpletons, and yet that isn’t presented as a somewhat challenging proposition when even 2008’s disastrous The Invasion noted the paradox of rooting for free will at the cost of world peace. To reference another 1979 film that’s been in the air this summer Caesar’s story involves us losing the ability to produce another Groucho Marx, Willie Mays, Louis Armstrong, Ingmar Bergman, Gustave Flaubert, Marlon Brando, Frank Sinatra, Paul Cezanne or even understand who they were or appreciate what they did. Hail, Caesar?

A chilling prologue shows the lights going out globally as the GenSys-created simian flu decimates humanity. A decade later Caesar (Andy Serkis) is in command of the apes in the Bay Area forest, flanked by scarred warrior Koba (Toby Kebbel), wise orangutan Maurice (Karin Konoval), and loyal Rocket (Terry Notary). There is tension between Caesar and his petulant son Blue Eyes (Nick Thurston), and everything falls apart when Rocket’s son Ash (Doc Shaw) is shot by Carver (The Black Donnellys’ Kirk Acevedo). Carver is part of a team led by Malcolm (Jason Clarke), which includes Malcolm’s wife Ellie (Keri Russell) and son Alexander (Kodi Smith-McPhee). They are trying to restart a dam to provide power to San Francisco’s human colony led by Dreyfus (Gary Oldman). The dam is Caesar’s, and Dreyfus gives Malcolm three days to negotiate a peaceful solution…

Matt Reeves inserts some visual trademarks; a lengthy tracking shot in which chaos explodes into frame, a fixed-position sequence from a tank turret’s POV, and a nicely vertiginous use of the Golden Gate bridge; but whereas Let Me In’s slow-burning approach achieved agonising levels of suspense, this is just agonising – Reeves takes forever to unfurl a very simple and remarkably boring plot. Technically everything’s competent: Michael Giacchino’s music is effective if uncharacteristic (no sad tinkly piano!), and Michael Seresin’s cinematography approaches that of Ain’t Them Bodies Saints, and would be commendable if it likewise served a mood – but you can’t help feel it’s hiding creaking CGI. Ah, CGI… This is our defining modern paradox; an air of distancing unreality hangs over everything, but the great technology and preparation that created it is extolled as cutting-edge and therefore preferable to engaging verisimilitude achieved practically. The non-ending is as insulting as that of The Hobbit: The Desolation of Smaug, and a trend that needs to be denounced: it’s like ending The Two Towers halfway through the battle of Helm’s Deep.

Writing takes effort. 2011’s reboot had a shocking poverty of characterisation but was a roaring success. Writing becomes much easier for Jaffa, Silver, and Bomback if they know the audience doesn’t want characterisation… Blue Eyes is petulant. That’s his one note. Then later he’s cowardly. He’s easily duped, because… and sides with Koba, because… then finds his steel, because… the script said so. Koba recalls Firefly’s “Curse your sudden, but inevitable, betrayal!” He discovers Dreyfus’ preparation for war and returns to warn Caesar, but loses his rag because he sees Caesar helping humans; except Caesar’s not actually helping them when Koba arrives… But hey, in event of plot emergency break glass for jerk, right? Carver’s rejoinder to Ellie’s fact – “The virus was created by scientists I don’t think the apes they were testing it on had much say in it” “Don’t give me that hippie-dippy bullshit” – is comically awful, but it’s easier to have jerks spark plot points rather than have Dreyfus and Malcolm’s reasonable disagreement over how to achieve their aim be teased out; perhaps that’s why Oldman is barely in this movie. By the climactic “What are you doing?” “Saving the human race!” gambit we’ve reached a truly low point where self-sacrifice that doesn’t work (like Alona Tal in Supernatural) isn’t tragic, but a running gag from 21 Jump Street.

Dawn of the Planet of the Apes is so poor it makes you nostalgic for the awful Rise of the Planet of the Apes. Whither Rod Serling’s scripting intelligence?